[PATCH] PR/26188, fix stdint.m4 for FreeBSD 4.11

[Paolo Bonzini]

The problem with FreeBSD 4.11 is that their stdint.h has uintptr_t but 
not uintmax_t.  stdint.m4 wrongly assumes that if a stdint.h (or 
inttypes.h, it does not matter) has no uintmax_t, it will only have 
uintXX_t or u_intXX_t types in it.

This patch fixes the problem by testing for uintptr_t as well.  I also 
made a few comments less verbose, since with these changes they were not 
precise anymore, either.

Bootstrapped/regtested on the affected system, as reported by Gerald on 
the PR audit trail, and on powerpc-apple-darwin8.5.0.

Ok for mainline?

Paolo
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